Previously on Quantico: At Quantico, the NATS team up for defensive driving lessons while tensions between Liam and Drew explode, resulting in shocking admissions and consequences. In the future, Simon grapples with his new reality in the aftermath of what’s transpired. Even though his friends try and help him, it’s uncertain he will ever be the same again.

In this sneak peek, the terrorists want Alex to swap the Senator’s pill bottle the one they provided. Inside the cap, there’s a small tracking device. Do the terrorists want to kill the Senator or do they have something else in mind? Be the first to see what happens in this season 1 episode 15 sneak peek of Quantico's next episode "Turn," airing SUNDAY MAR 27 10|9c on ABC.

About Turn:A terror cell tries to infiltrate Quantico, forcing Miranda and Liam to pay a deadly price. While in the future, Alex continues to get instructions from the terrorist – only this time, it’s Claire Haas’ (played by Marcia Cross) life that hangs in the balance.